Marine engineer jobs are similar to other engineers, they need to specialize in the entire field of marine world, from the up keep of machinery, working on the ship, making sure everything is in working order, repair and maintenance of the ship, all the working parts of the ship, supervising all the worker on the ship. working as a marine engineer is like working in a office but your working in a ship everything it takes to keep the ship in working order is what they're in charge of.